#3 Randy Couture
Randy Couture had done about all he could do in the MMA world after losing his trilogy fight with Chuck Liddell at UFC 57 in 2006. We thought we had seen the last of him. Couture was only 43 after all...
But just a year later, the legend returned. But this time he was back at his original weight class of Heavyweight where he was granted a title shot against the 23-2 giant, Tim Sylvia.
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The fight that followed went completely the opposite of how everyone thought it would.
The defending champion and much larger, Sylvia was the clear favourite and was thought to be getting just another title defence over a legendary name. But few seconds into the fight, Couture showed he wasn't messing around with his comeback.
Couture dropped Sylvia with a huge right hand, roughly in seven seconds into the opening round and from there on out, the fight was his. Landing consistently with his right hand accompanied by a plethora of takedowns, the undersized Couture dominated Sylvia for five rounds straight.
This was Couture's sixth career title victory (seventh counting the UFC 13 tournament) and easily his most shocking. Coming back at 44 years of age and taking on his biggest foe yet and beating him with ease was and still is one of the most shocking fight results MMA fans have ever seen.
Almost crazier, Couture would go on to successfully defend the title afterwards against Gabriel Gonzaga before dropping it to Brock Lesnar. Upon re-watch, everyone accepted that Couture did much better than people remember and gave him credit for his bout against the "dwarfingly" large Lesnar.
There's a reason they call Couture "Captain America". He's like a movie hero. He defied the odds more than once.